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Finding the Fourth Proportional to 413.35, 619.80 and 139.30

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Solution

The fourth proportional to 413.35, 619.80 and 139.30 is: 208.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    413.35 : 619.80 = 139.30 : x
  2. Step 2: Convert to fraction form
    413.35/619.80 = 139.30/x
  3. Step 3: Cross multiply
    413.35x = 619.80 × 139.30
  4. Step 4: Simplify right side
    413.35x = 86,338.14
  5. Step 5: Solve for x
    x = 86,338.14/413.35
  6. Step 6: Final answer
    x = 208.87

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